|Limits, philosophy: here we are concerned with the classification of knowledge domains or the identification of possibilities for thought. We need to determine what belongs to a domain and what does not. Problems arise wherever something is to be described beyond an area by the means of this area itself ('impracticability', 'unthinkability','inconceivability'), as well as where an area is solely covered by means originating from this area itself ( Circularity).|
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Life / meaning / purpose / Nozick: to search for the meaning of life is, to cross borders - thesis: the meaning of life consists in(as many as possible) connections to other things - for the old man the value of life seems to lay in the missed alternatives. - Sartre: we define ourselves by what we exclude.
Philosophical Explanations Oxford 1981
The Nature of Rationality 1994